Fill in the blanks in the following sentences with the correct form of the verb.

Cook (1995) (claim) that the solution (can) be improved by...
Early studies by Blake and Iwaki (find) that...
Haberditzl (show) that the velocity of many enzyme reactions (be slowed down) if the end product (have) an increased paramagnetism.

Fill in the blanks with the correct past and past perfect verb forms.

When he (arrive), the meeting (start).
She (tell) me that she (find) a job.
Yesterday she (report) that a number of errors (be identified) in the analysis of results.